...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of hydrometeorology >Impact of initial soil moisture anomalies on subsequent precipitation over North America in the coupled land-atmosphere model CAM3-CLM3
【24h】

Impact of initial soil moisture anomalies on subsequent precipitation over North America in the coupled land-atmosphere model CAM3-CLM3

机译：土地-大气耦合模型CAM3-CLM3对北美地区初始土壤湿度异常对随后降水的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To investigate the impact of anomalous soil moisture conditions on subsequent precipitation over North America, a series of numerical experiments is performed using a modified version of the Community Atmosphere Model version 3 and the Community Land Model version 3 (CAM3-CLM3). First, the mechanisms underlying the impact of spring and summer soil moisture on subsequent precipitation are examined based on simulations starting on 1 April and 1 June, respectively. How the response of precipitation to initial soil moisture anomalies depends on the characteristics of such anomalies, including the timing, magnitude, spatial coverage, and vertical depth, is then investigated. There are five main findings. First, the impact of spring soil moisture anomalies is not evident until early summer although their impact on the large-scale circulation results in slight changes in precipitation during spring. Second, precipitation increases with initial soil moisture almost linearly within a certain range of soil moisture. Beyond this range, precipitation is less responsive. Third, during the first month following the onset of summer soil moisture anomalies, the precipitation response to wet anomalies is larger in magnitude than that to dry anomalies. However, the resulting wet anomalies in precipitation quickly dissipate within a month or so, while the resulting dry anomalies in precipitation remain at a considerable magnitude for a longer period. Consistently, wet spring anomalies are likely to be ameliorated before summer, and thus have a smaller impact ( in magnitude) on summer precipitation than dry spring anomalies. Fourth, soil moisture anomalies of smaller spatial coverage lead to precipitation anomalies that are smaller and less persistent, compared to anomalies at the continental scale. Finally, anomalies in shallow soil can persist long enough to influence the subsequent precipitation at the seasonal time scale. Dry anomalies in deep soils last much longer than those in shallow soils.
机译：为了研究北美地区异常土壤湿度条件对随后降水的影响，使用了修订版的社区大气模型第3版和社区土地模型第3版（CAM3-CLM3）进行了一系列数值实验。首先，分别基于4月1日和6月1日开始的模拟，研究了春季和夏季土壤水分对后续降水影响的潜在机理。然后研究了降水对初始土壤湿度异常的响应如何取决于此类异常的特征，包括时间，幅度，空间覆盖率和垂直深度。有五个主要发现。首先，春季土壤水分异常的影响直到夏初才显现出来，尽管它们对大规模循环的影响导致春季降水的轻微变化。第二，在土壤水分的一定范围内，降水随土壤初始水分的增加而线性增加。超出此范围，降水的响应性较差。第三，在夏季土壤湿度异常发生后的第一个月内，对湿异常的降水响应比对干异常的降水响应更大。但是，所产生的降水中的湿异常在一个月左右的时间内迅速消散，而所产生的降水中的干异常在相当长的时间内保持相当大的幅度。一致地，湿春季异常可能在夏季之前得到改善，因此对夏季降水的影响（幅度）比干春季异常小。第四，与大陆规模的异常相比，较小的空间覆盖率的土壤湿度异常导致降水异常较小且持续时间较小。最后，浅层土壤中的异常现象可以持续足够长的时间，从而影响随后的季节性降水。深层土壤的干旱异常持续时间比浅层土壤的干旱持续时间长得多。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号